Zaratite is a bright emerald green nickel carbonate mineral with formula Ni3CO3(OH)4·4H2O.

Zaratite crystallizes in the isometric crystal system as massive to mammillary encrustations and vein fillings.

It is a rare secondary mineral formed by hydration or alteration of the primary nickel and iron bearing minerals, chromite, pentlandite, pyrrhotite, and millerite, during the serpentinization of ultramafic rocks.

It was found originally in Manolita mine, Teixedelo, Cedeira, La Coruña province, Galicia, Spain[5] in 1851, and named after Spanish diplomat and dramatist Antonio Gil y Zárate (1793–1861).

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